leetcode-problemset/leetcode-cn/originData/build-an-array-with-stack-operations.json

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        "question": {
            "questionId": "1552",
            "questionFrontendId": "1441",
            "categoryTitle": "Algorithms",
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            "title": "Build an Array With Stack Operations",
            "titleSlug": "build-an-array-with-stack-operations",
            "content": "<p>You are given an integer array <code>target</code> and an integer <code>n</code>.</p>\n\n<p>You have an empty stack with the two following operations:</p>\n\n<ul>\n\t<li><strong><code>&quot;Push&quot;</code></strong>: pushes an integer to the top of the stack.</li>\n\t<li><strong><code>&quot;Pop&quot;</code></strong>: removes the integer on the top of the stack.</li>\n</ul>\n\n<p>You also have a stream of the integers in the range <code>[1, n]</code>.</p>\n\n<p>Use the two stack operations to make the numbers in the stack (from the bottom to the top) equal to <code>target</code>. You should follow the following rules:</p>\n\n<ul>\n\t<li>If the stream of the integers is not empty, pick the next integer from the stream and push it to the top of the stack.</li>\n\t<li>If the stack is not empty, pop the integer at the top of the stack.</li>\n\t<li>If, at any moment, the elements in the stack (from the bottom to the top) are equal to <code>target</code>, do not read new integers from the stream and do not do more operations on the stack.</li>\n</ul>\n\n<p>Return <em>the stack operations needed to build </em><code>target</code> following the mentioned rules. If there are multiple valid answers, return <strong>any of them</strong>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> target = [1,3], n = 3\n<strong>Output:</strong> [&quot;Push&quot;,&quot;Push&quot;,&quot;Pop&quot;,&quot;Push&quot;]\n<strong>Explanation:</strong> Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nPop the integer on the top of the stack. s = [1].\nRead 3 from the stream and push it to the stack. s = [1,3].\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> target = [1,2,3], n = 3\n<strong>Output:</strong> [&quot;Push&quot;,&quot;Push&quot;,&quot;Push&quot;]\n<strong>Explanation:</strong> Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nRead 3 from the stream and push it to the stack. s = [1,2,3].\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> target = [1,2], n = 4\n<strong>Output:</strong> [&quot;Push&quot;,&quot;Push&quot;]\n<strong>Explanation:</strong> Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nSince the stack (from the bottom to the top) is equal to target, we stop the stack operations.\nThe answers that read integer 3 from the stream are not accepted.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= target.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= n &lt;= 100</code></li>\n\t<li><code>1 &lt;= target[i] &lt;= n</code></li>\n\t<li><code>target</code> is strictly increasing.</li>\n</ul>\n",
            "translatedTitle": "用栈操作构建数组",
            "translatedContent": "<p>给你一个数组 <code>target</code> 和一个整数 <code>n</code>。每次迭代，需要从&nbsp; <code>list = { 1 , 2 , 3 ..., n }</code> 中依次读取一个数字。</p>\n\n<p>请使用下述操作来构建目标数组 <code>target</code> ：</p>\n\n<ul>\n\t<li><code>\"Push\"</code>：从 <code>list</code> 中读取一个新元素， 并将其推入数组中。</li>\n\t<li><code>\"Pop\"</code>：删除数组中的最后一个元素。</li>\n\t<li>如果目标数组构建完成，就停止读取更多元素。</li>\n</ul>\n\n<p>题目数据保证目标数组严格递增，并且只包含 <code>1</code> 到 <code>n</code> 之间的数字。</p>\n\n<p>请返回构建目标数组所用的操作序列。如果存在多个可行方案，返回任一即可。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>target = [1,3], n = 3\n<strong>输出：</strong>[\"Push\",\"Push\",\"Pop\",\"Push\"]\n<strong>解释： \n</strong>读取 1 并自动推入数组 -&gt; [1]\n读取 2 并自动推入数组，然后删除它 -&gt; [1]\n读取 3 并自动推入数组 -&gt; [1,3]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>target = [1,2,3], n = 3\n<strong>输出：</strong>[\"Push\",\"Push\",\"Push\"]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>target = [1,2], n = 4\n<strong>输出：</strong>[\"Push\",\"Push\"]\n<strong>解释：</strong>只需要读取前 2 个数字就可以停止。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= target.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= n &lt;= 100</code></li>\n\t<li><code>1 &lt;= target[i] &lt;= n</code></li>\n\t<li><code>target</code> 严格递增</li>\n</ul>\n",
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